The 462 heptatonic modes are grouped into 31 classes, ordered from the “brightest” to the “darkest”. Browse through more than 5000 audio examples in MIDI file format.

Pierre Audétat developed this construction in 2006 in order to investigate the heptatonic modes of the equal temperament. It has since then been generalised to a wider set of temperaments. Microtonal and macrotonal bells are avaialble as well.